JP4218852B2 - Circuit unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit unit that accommodates a circuit board and is interconnected with an external device through a connector connected to a cable or the like.
[0002]
[Prior Art and Problems to be Solved by the Invention]
Examples of this type of circuit unit are disclosed in Japanese Unexamined Patent Publication Nos. 4-354356 and 10-21988. According to the circuit unit disclosed in the former, a plurality of terminals are supported in a case manufactured by resin molding, and the terminals constitute a fitting connection portion along the outer surface of the case and are bonded inside for wire bonding. Provide a connection. A fitting frame is formed by the case around the fitting connection portion of the terminal to provide a waterproof effect. The case accommodates a circuit board on which predetermined electrical components or electronic components are mounted. The circuit board is bonded to the bonding connection portion of the terminal. Wire bonding is not preferable because it is troublesome in manufacturing and increases the manufacturing cost.
[0003]
On the other hand, according to the circuit unit disclosed in the latter, the connector is mounted on the board accommodated in the case. The connector includes a fitting portion used for connection with an external connector. The fitting portion is placed surrounded by a fitting frame formed integrally with the case, thereby completing the fitting structure. In this configuration, since the mating connector fitted to the circuit unit is fitted to the connector mounted on the circuit board, the wire bonding process is not required, and the manufacturing process is simplified. However, the connector needs to be accurately positioned and fixed with respect to the case. If positioning between the connector mounted on the circuit board and the case is not performed accurately, the contact in the board mounted connector or the mating connector may be deformed by the twisting force during fitting. Produce.
[0004]
Accordingly, an object of the present invention is to realize a circuit unit that can be easily manufactured and assembled and has high reliability in electrical connection.
[0005]
In the present invention, a plurality of terminals supported by a case formed of resin constitutes a fitting structure on the inside and outside of the case, and the inside fitting structure is formed on a circuit board accommodated in the case. connector fitting is mounted, the terminal provides a circuit unit which is characterized that you have branched to a plurality of terminals within said case.
[0006]
Preferably, the connector and the inner fitting structure are provided at a plurality of locations.
[0007]
Preferably, at least a part of the connector and the inner fitting structure provided at a plurality of locations are provided apart from each other.
[0008]
Preferably, the connector has key means or guide means for fitting into the inner fitting structure.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A circuit unit according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
[0010]
1A and 1B are diagrams showing a circuit unit according to a first preferred embodiment of the present invention, in which FIG. 1A is a left side view, FIG. 1B is a plan view, and FIG. 1C is a right side view. FIG. 2 is an exploded cross-sectional view at a position along the line AA in FIG. FIG. 3 is an exploded perspective view of the circuit unit of FIG.
[0011]
The circuit unit 10 according to the present invention includes a case 20 formed of resin and a plurality of conductive terminals 50 supported by the case 20. The terminal 50 is surrounded and supported by a resin when the case 20 is molded. A first fitting portion 15 that can be fitted with the mating connector is formed on one side surface of the case 20. In the present embodiment, three first fitting portions 15 are set. Inside the first fitting portion 15, a pin-shaped first male contact portion 51 that is a part of the terminal 50 is provided. The other end of the terminal 50 extends through the thick portion of the resin of the case 20 and constitutes a second male contact portion 53 in the second fitting portion 16 facing the bottom side.
[0012]
The case 20 is configured to receive the circuit board 100 on the bottom side. A plurality of connectors 110 that accommodate female contacts (not shown) are mounted on the circuit board 100. When the circuit board 100 is accommodated in the case 20, the connectors 110 are fitted into the second fitting portions 16, whereby the circuit on the circuit board 100 and the terminals 50 in the case 20 are connected to each other. The The connector 110 may be formed with guide means for smooth fitting with the second fitting portion 16 or key means (concave / engagement engaging portion) 118 for determining the fitting direction. According to the present embodiment, six connectors 110 are mounted on the circuit board 100. They are mounted at a position close to each side where a pair of adjacent connectors form a pair, and two sets are separated from each other on one end side, and the other set is mounted at a substantially central position on the other end side. .
[0013]
Cover member 40 is attached to case 20 so as to surround circuit board 100. The cover member 40 is provided with a support portion 41 that supports the circuit board 100 from behind in order to prevent the connector 110 from being unfitted. The cover member 40 is fixed to the case 20 by a mechanical fixing means (not shown) such as a screw or latch means or an adhesive fixing means such as ultrasonic welding. Thereby, the cover member 40 and the case 20 protect the circuit board 100 by waterproofing. As shown in FIG. 2, a prevention seal 43 having a substantially U-shaped cross section disposed so as to surround the protruding end edge 45 of the cover member 40 from three directions is press-fitted and received in the concave groove 23 of the case 20 together with the protruding end edge 45. Thus, good waterproof properties are provided. Although not shown, a pressure adjusting means for adjusting the pressure inside the sealed circuit unit 10 may be provided.
[0014]
The advantage of the circuit unit 10 is that it can be manufactured and assembled very easily. In particular, the fitting of the second fitting portion 16 and the connector 110 guides the mounting of the circuit board 100, and the circuit board 100 is accurately positioned with respect to the case 20 and maintained in that position. Further, the use of the connector 110 enables multipolar connection. Furthermore, according to the circuit unit 10, as can be understood particularly with reference to FIG. 1, complete waterproofness can be maintained on the top portion and the side portion excluding the first fitting portion 15. Moreover, the use of the connector 110 can be realized with high reliability enough effective fitting length is set connected.
[0015]
FIG. 4 is a diagram schematically showing an exploded view of a circuit unit according to a second preferred embodiment of the present invention.
[0016]
According to the circuit unit 60 according to the second embodiment, the second fitting portion 66 provided in the case 70 is configured to face the horizontal direction. The circuit board 200 is moved in the horizontal direction after the connector 210 mounted thereon is inserted into the inside of the case 70, whereby the connector 210 is fitted to the second fitting portion 66 from the horizontal direction. Is done. In the present embodiment, the inclined portion 72 is formed at one corner end of the bottom surface of the case 70 to set a space for allowing the circuit board 200 to move and to make the circuit unit 60 small. When the fitting dimension with the fitting portion 66 can be set inside the case 70, the corner end of the case can be formed in a rectangular shape. In the present embodiment, in order to provide the waterproof property of the circuit unit 60, a protrusion 91 including an inclined edge is formed on the cover member 90 corresponding to the inclined portion 72. As with the first preferred embodiment, the cover member 90 is fixed to the case 70 by a known fixing method, whereby the circuit board 200 is waterproofed and protected.
[0017]
As described above, the circuit unit according to the preferred embodiment of the present invention has been described. However, this is merely an example, does not limit the present invention, and various modifications can be made by those skilled in the art.
[0018]
【The invention's effect】
According to the circuit unit of the present invention, the plurality of terminals supported by the case formed of resin constitutes a fitting structure on the inside and outside of the case, and the inside fitting is placed on the circuit board accommodated in the case. Since the connector that fits into the joint structure is mounted, the manufacturing and assembly can be performed very easily, especially by the fitting between the inner fitting portion and the connector mounted on the circuit board, The mounting of the circuit board is guided, and the circuit board is accurately positioned with respect to the case and maintained in that position. In addition, the use of a connector enables multipolar connection.
[Brief description of the drawings]
1A and 1B are diagrams showing a circuit unit according to a first preferred embodiment of the present invention, in which FIG. 1A is a left side view, FIG. 1B is a plan view, and FIG.
FIG. 2 is an exploded cross-sectional view at a position along line AA.
3 is an exploded perspective view of the circuit unit of FIG. 1. FIG.
FIG. 4 schematically shows an exploded view of a circuit unit according to a second preferred embodiment of the present invention.
[Explanation of symbols]
10 circuit unit 15 outer fitting structure 16, 66 inner fitting structure 20, 70 case 50 terminal 100, 200 circuit board 110, 210 connector

Claims (5)

A plurality of terminals supported by a case formed of resin constitute a fitting structure inside and outside the case, and a connector that fits the inside fitting structure on a circuit board accommodated in the case Is implemented ,
Circuit unit and the terminal, characterized that you have branched to a plurality of terminals within said case.   The circuit unit according to claim 1, wherein the connector and the inner fitting structure are provided at a plurality of locations.   The circuit unit according to claim 2, wherein the number of the connector and the inner fitting structure is larger than the number of the outer fitting structures.   2. The circuit unit according to claim 1, wherein at least a part of the connector and the inner fitting structure provided at a plurality of locations are spaced apart from each other.   The circuit unit according to claim 1, wherein the connector includes key means or guide means for fitting into the inner fitting structure.

Images